7. Scoop up 1/3 of the batter (step 6) into another mixing bowl. Mix well with chocolate mixture (step 2) to make chcolate batter.

8. Pour the plain batter into the cake tin, then add in chocolate batter, lightly swirl the batter with a spatula to make marble patterns.

9. Bake at preheated oven at 160 degrees C for 15 minutes ( utill the batter surface looks dry, remember not to wait till the cake cracks, it would be too late and you will not be able to cover the top with crumbs)

10. Remove cake, evenly coat the top with crumb topping.

11. Place back into the oven, bake for another 20-25 minutes or until skewer inserts in comes out clean. ( I baked for 45 minutes in my case )